Device for mixing bulks



Jan. 22, 1952 J BAKKER 2,583,135

DEVICE FOR MIXING BULK-S Filed Dec. 25, 1947 Johannes BCLKKcr IN VE/Y T0 K Patented Jan. 22, 1952 f nnvloaron MIXING BULKS Johannes Bakker, Lange Ruige Weide,

Netherlands Application December 23, 1947, Serial No. 793,348 In the N etherlands January 9, 1946 Section 1, Public Law 690, August 8, 1946 Patent expires January 9, 1966 1 Claim. (01. 259-180) The invention relates to a device for mixing fbulks" by means of containers that have been arranged in layers over one another. In this case by bulks are in the first place understood solid matters in pulverizedor granular form (like cement, sand, etc.) and fluids. This group, however, also comprises materials consisting of parts that may be much coarser or/and also very irregular in form (gravel, stone-chips, coals of various sizes and screen-measures etc.) and finally also matters of a more doughy nature (concrete, moist earth etc).

Existing mixing-machines for these materials are generally based. on the principle of stirring the components (e. g. concrete-mills). This stirring requires, however, much energy and the applied apparatus is greatly liable to wear. Besides this apparatus there are, however, also known devices that are operating more "statically, based on the thought to make the material that is to be mixed, interfiow in partial streams.

The invention aims at an improvement of these devices.

The device according to the invention has containers that are placed over one another. The inputs of a number of lower containers reach under each of the outputs of the before mentioned ones, the outputs of the lowest containers ending in a common collecting space. It is possible to obtain thus in a very simple way a very thorough mixing method, which will be demonstrated below. When the material, issued by a container, is divided over n lower containers, this means that an n-fold division takes place after the first, i. e. the topmost container or containers have been left. tainer or containers have been left (reckoned downward), again an n-fold division takes place, totally an n -fo1d division having been effected. If p containers (or layers of containers) are situ ated over one another, the material will ultimately have been divided and re-united 11 times, which is a measure for the intermixing.

If each container empties on four lower containers (4-fold) division, and in case there are twenty layers of containers, then the material is divided totally 4 that is about 275 milliard times, which undoubtedly means a very thorough way of mixing.

It is, moreover, an advantage that already this mixing can be realized in a stationary apparatus, to which material can be applied constantly and from which it can be derived also incessantly, a continuous mixing process being the result. Most Also after the following conmixing devices that are based on a stirrin method, deal with the material in portions and consequently are working non-continuously. It is, however, also possible to construct non-continuously working devices according to the invention, which devices can be generally equipped very concisely.

The device according to the invention is especially meant and suitable for mixing and preparing fluid concrete. In this procedure the drying of the cement, the sand and the gravel is of great importance, which is usually not properly effected in the known concrete-mixers. When after the dry-mixing process water is added to the mixture, the latter must be well inter-mixed, which is preferably to be done in the same equipment, at least in an equipment according to the invention. This procedure creates, however, the nappy, binding concretemass, which easily sticks and not easily flows. Especially for this case it is recommendable according to the invention to connect all the containers (or at least some of them), through which the Whole sticky mass passes, to a movingdevice, which moves them continuously or periodically.

The moving-device may be a vibration-motor.

The invention will be illustrated by means of the drawing.

Fig. l is a perspective view of the outfit of containers, and

Fig. 2 is a top plan view of the same.

The containers consist of open funnels, which can easily be joined together in layers. The material is shed into the topmost funnel 4. Under this funnel there is a layer 5 of four funnels, the centre of which is perpendicularly under the middle of the outlet of the topmost funnel 4. Thus the material flowing from the funnel 4, is separated into four quantities and divided over the four funnels, of the layer 5. Under the layer of funnels 5 there is a layer of funnels 6, in which the funnels have been so positioned that regularly the common point of four funnels lies in the centre of a funnel from the layer 5. So here also a 4-fold division is effected. Ultimately the material falls into the collective container and then it has been divided and re-united 4 :16 times.

The side walls of the containers are so arranged that the containers are triangular in cross section in a plane at right angles to the direction of material flow.

What I claim is:

A device for mixing materials which are capable of flowing under the action of gravity which comprises a plurality of superposed open containers, each of said containers having relatively thin side walls and an outlet opening in the bottom thereof for said material, said side walls being scarranged that the containers are triangular in cross-section in a plane at right angles to the direction of material flow, said containers being arranged in a plurality of superimposed layers; the open top sides of the containers in such a layer lying in a plane at right angles to the direction of material flow, the separating walls between the containers forming in said plane a pattern .of intersecting lines, said layers and said patterns in same being so arranged that the material leaving any one container through the outlet opening in the bottom thereof flows towards a point of intersection of the said intersecting lines in the next layer of containers in the direction of flow and thus is distributed to at least three containers, said points of intersection lying in the axis of flow of material coming through said outlet opening of the container popoint of intersection, which side walls direct said material into the containers whose side walls meet at said point of intersection.

J OHANNES BAKKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 722,782 Weaver Mar. 17, 1903 832,400 Lyons Oct. 2, 1906 1,317,942 Reed Oct. 7, 1919 1,496,896 Laffoon June 10, 1924 1,571,926 Babka Feb. 9, 1926 

